| Current (2) |
| Chairman | 2024 |
| Board of Directors | 2024 |
| Former (15) |
| Board of Directors | 2014 – 2024 |
| Board of Directors | 2014 – 2024 |
| Chairman | 2008 – 2013 |
| Deputy Chairman | 1988 – 1994 |
| Board of Directors | 1988 – 1988 |
| Deputy Chairman | 1988 – 1997 |
| Board of Directors | 2008 – 2015 |
| Chairman | 1997 – 2004 |
| Chairman | 1988 – 1990 |
| Chairman | 2004 – 2008 |
| Board of Directors | 1988 – 2007 |
| Board of Directors | 2014 – 2024 |
| Chairman | 1988 – 2002 |
| Board of Directors | 1988 – 1988 |
| Chairman | 2013 – 2020 |